River Fullsæll has its source in Bjarnarfell and Sandfell and flows in Brúará between Efri-Reykir and Syðri-Reykir. At the top it is called Andalækur, but after Graflækur merges with Andalækur the river is called Fullsæll all the way to Brúará. This is a relatively shallow and colored river and often carries quite a bit of sediment. However, there are some nice fishing spots. There is a considerable number of fish in the river, both char and trout, which are often in the range of 1 ~ 2 pounds, but there are also some larger fish.